Christina Aguilera, left, and Pitbull perform at the 40th Anniversary American Music 

Christina Aguilera, left, and Pitbull perform at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by John Shearer/Invision/AP)
Associated Press
Christina Aguilera, left, and Pitbull perform at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by John Shearer/Invision/AP)
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